Deformations of Geometrically Imperfect Beams
Deformations of Geometrically Imperfect Beams
复制标题
几何不完美梁的变形
DOI：
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发表时间：
1969
期刊：
影响因子：
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通讯作者：
N. Trahair
中科院分区：
文献类型：
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作者：
N. Trahair
研究了具有等端弯矩或中心集中荷载的简支工字形梁的弹性变形问题，分析了几种典型的缺陷对梁的弹性变形的影响，结果表明，每种缺陷都可以近似为一个等效的正弦初始弯曲或扭转。然后，利用这一研究结果，对Massey提出的弹性临界载荷外推的线性作图法进行了检验，并得出结论：用这种方法得到的曲线可能是非线性的。提出了一种改进的外推方法，并将该方法从大量实验测量中得到的临界载荷估计值与Massey图估计值和理论预测值进行了比较。
The effects of a number of representative types of imperfection on the elastic deformations of simply supported I-beams with either equal end moments or central concentrated load are investigated, and it is shown that each of these imperfections can be approximated by an equivalent sinusoidal initial crookedness or twist. The results of this investigation are then used in an examination of a linear plot method of extrapolating for the elastic critical load devised by Massey, and it is concluded that the plots obtained by this method may be nonlinear. An improved method of extrapolation is suggested and the critical load estimates made by this method from a number of experimental measurements are compared with the Massey plot estimates and the theoretical predictions.